高压放电降解甲基红废水的研究

Study on degradation of methyl red wastewater by high-voltage discharge

研究了甲基红废水在针—管式反应器中的循环流动降解行为,用UV-Vis、FT-IR、GC/MS分析了甲基红降解过程的中间产物并推测降解机理。研究结果表明:150 Hz的30 kV高压放电作用下,甲基红模拟废水经过120 min放电作用后降解率达到90.4%。随着高压放电的进行,废水体系的电导率和pH值都增大,影响甲基红的降解。高压放电条件下甲基红的降解过程可能是其分子的偶氮双键被液电等离子条件下形成的自由基攻击所破坏。

The high-voltage discharge technology is a newly developed oxidation technology for removing hazardous organic compounds from wastewater.The degradation of methyl red wastewater treated by high-voltage discharge in diagram of pin-cylinder discharge reactor was studied and UV-Vis、FT-IR and GC/MS were used to analyze the oxidation semi-products in order to uncover the degradation mechanism.Results showed that when the methyl red wastewater was discharged at 30 kV of peak voltage with 150 Hz for 120 min,the degradation rate of methyl red reached 90.4%.With the increasing of the discharged time,both the conductivity and pH value of methyl red wastewater increased.The degradation of methyl red could be due to the break down of the azo bond which might be induced by the free radical attacking under high-voltage discharge condition.